Zieliński, Marcin. “Cardinality of the Sets of All Bijections, Injections and Surjections”. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia 11 (December 5, 2019): 143–151. Accessed November 21, 2024. https://didacticammath.uken.krakow.pl/article/view/6912.